Question

A student is given 1.6604 g of an unknown copper compound. Following the isolation by displacement...

A student is given 1.6604 g of an unknown copper compound. Following the isolation by displacement by Mg, 0.7193 g of Cu metal is recovered.

a.What is the percentage of Cu in the sample?

b.What is the formula weight of the compound? (Assume one mole of the compound contains one mole of copper.)

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Answer #1

mass of compound = 1.6604 grams

mass of copper = 0.7193 grams

% of copper= mass of copper/mass of compound x100

% of copper = 0.7193/1.6604 x100 = 43.3%

% of copper = 43.3%

b) mass of copper = 0.7193 grams

molar mass of compound = 63.5 gram/mole

number of moles of copper = 0.7193/63.5 = 0.0113 moles

number of moles = mass/molar mass of compound

molar mass of compound = mass/number of moles = 1.6604/0.0113 = 146.9 gram/mole

formula weight of the compound = 146.9 gram/mole.

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